ASSESSMENT OF CHROMIUM CONCENTRATIONS IN SOIL-PLANT-ANIMAL CONTINUUM: POSSIBLE RISK FOR GRAZING CATTLE
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1 Pak. J. Bot., 42(5): , 21. ASSESSMENT OF CHROMIUM CONCENTRATIONS IN SOIL-PLANT-ANIMAL CONTINUUM: POSSIBLE RISK FOR GRAZING CATTLE ZAFAR IQBAL KHAN 1, KAFEEL AHMAD 1, NASIRA RAZA 1, F. AL-QURAINY 2, MUHAMMAD ASHRAF 2,3 AND ABRAR HUSSAIN 4 1 Department of Biological Sciences, University of Sargodha, Sargodha, Pakistan 2 Department of Botany and Microbiology, King Saud University, Riyadh, Saudi Arabia 3 Department of Botany, University of Agriculture, Faisalabad, Pakistan 4 Science and Technology Division, University of Education, Township, Lahore, Pakistan * Corresponding authors: zafarbotanist@yahoo.com Fax ; Abstract The present study was conducted to examine the chromium (Cr) status of soil, forage and lactating cows at Livestock Experimental Station, Khizerabad, Sargodha, Pakistan. Samples of soil, forage, blood plasma and milk were collected periodically with a regular interval of one month each and subjected to acid digestion to assess the influence of the sampling intervals on Cr as well as the transfer of this element from soil to forage and onwards to animal during the whole experimentation period. The Cr contents of soil and forage were severely deficient in relation to the requirement for forage and ruminant growth and development, whereas that of blood plasma and milk was marginal deficient level. Supplementing the deficient levels of Cr with locally available feed resources and mineral mixtures having high availability of this element would alleviate the deficiency of chromium in the animal ranch. Introduction Appraisal of mineral status of grazing ruminants/livestock primarily involves sampling of forages fed to animals and soil used for growing these forage plants. A sample is of greatest value from soil, plant and tissues of animal in question and also depends upon the mineral to be determined from these variables (McDowell, 1985). Since the soil, plant and animal system is very intricate so it has not been thoroughly examined in many developing countries including Pakistan. Thus, gaining information on the status and interrelationships of inorganic minerals in the afore-mentioned system is vital for achieving maximal livestock productivity. The forage plants under specific conditions may absorb toxic metals from soil as well as from metal deposits on the surfaces of plant parts exposed to a polluted environment. Furthermore, fertilizers containing heavy metals is an additional source of metal pollution for forage plants. Regardless of all this, trace amounts of some metals like copper, cobalt, zinc, manganese and chromium are essentially required for a normal animal and plant growth (Tokalioglu et al., 2; Bratakos et al., 22). Chromium (Cr) is a trace element that is most commonly found in nature in the three and six oxidation states, and the latter form of Cr is an oxidizing mineral which is employed in most of the processes related to industry. Like many other metals, it also plays an important role in the metabolism of living organisms (Tokalioglu et al., 2; Tokaliglu & Kartal, 25). Chromium has been considered as an essential trace element for man and laboratory animals (Anon., 1997), because it plays a variety of roles in the metabolisms of both animals and plants (McDowell, 23). Regardless of a substantial role of Cr in various physiological processes in ruminants, the information on Cr availability to animals is
2 341 ZAFAR IQBAL KHAN ET AL., very limited. Chromium concentration for livestock requirement ranges from.3 to 1.6 mg/kg which is generally higher than the available Cr to livestock (Anon., 1997). Chromium levels higher than these values are toxic to livestock and it badly affects the reproductive potential of ruminants (McDowell, 23; McDowell & Arthington, 25). Keeping in view the importance of this element to livestock, the premier aim of the present investigation was to authenticate the practicability of broad feeding pattern for free grazing ruminants rather than appraising the actual daily Cr ingestion for animals. Materials and Methods The study was conducted during at Khizer Abad Livestock Experimental Station, located in central Punjab, district Sargodha, Pakistan. The detailed description of this site has been given elsewhere (Khan et al., 21). Although about 5 animals are being nurtured at the station, the number of Sahiwal breed cows is 128. Soil, forage, milk and blood samples were collected four times each with one month interval during winter to assess the variation in the mineral concentrations during transfer of the metal from soil to plants (forage) and onwards to animals during the study period. Soil and forage samples were collected randomly from 5 different sites within the pasture at regular intervals of one month each during the research period (winter season). The soil samples were collected from 15 to 2 cm depth. All soil and forage samples were ovendried at appropriate temperatures until constant dry weights. The major forage species recorded at the pasture during winter were Medicago sativa and Trifolium alexandrinum, and the minor species Brassica campestris, Cichorium intybus, and Avena sativa. After proper drying, the plant and soil samples were ground well and made to powder. Twenty each of clinically healthy lactating cows of Sahiwal breed in their second lactation, with average body weight of 315 kg were investigated for the study purpose. The experimental animals were allowed to graze in the pasture whole day daily. The forage and blood samples of lactating cattle were collected concurrently when soil and forage sampling was done, from this ranch with one month interval. Milk samples were also collected from these cows for the analysis of chromium. These milk samples were then homogenized and preserved in plastic disposable bottles and frozen at -2 o C.Blood plasma was harvested by centrifugation at 3 rpm for 15-3 min. Plasma was separated. Plasma samples were put into clean labeled polypropylene vessels and frozen at -2 C. One g soil and.5 g forage dried and ground samples were digested in a mixture of H 2 SO 4 and H 2 O 2 at high temperatures. After the digestion of both types of samples was complete they were made to desired volumes with double distilled water. A sample of 1 ml of each of blood plasma or milk was taken in a conical flask and dried slowly at 15 o C for 3 min. After drying, all samples were digested with H 2 SO 4 and H 2 O 2 in 1:2 ratio. After completing digestion the clear solution was filtered and the volume was made up to 5 ml by adding double distilled water. The concentrations of chromium in soil and forage were determined using an atomic absorption spectrophotometer (Model #AA-63, Shimadzu, Japan). For the analysis of chromium from the plasma samples atomic absorption spectrophotometer coupled with a graphite furnace was used (AA-63 & GFAEXi7i, Shimadzu, Japan). Statistical analysis: Data for Cr content of different types of samples were analyzed statistically using the SPSS software. A one-way analysis of variance (ANOVA) of each variable was worked out. Furthermore, correlations among soil, forage, plasma and milk Cr contents were also calculated using the SAS software.
3 ASSESSMENT OF CHROMIUM IN SOIL-PLANT-ANIMAL CONTINUUM 3411 Results and Discussion Chromium is one of the important trace elements involved in animal growth and development (Parish & Rhinehart, 28). Although improvement in growth performance and immune response in stressed cattle has been reported with Cr supplementation, beef cattle producers do not normally use chromium supplementation under normal conditions (Parish & Rhinehart, 28). Furthermore, chromium is far more abundant in soil than in crops (Underwood & Suttle, 1999). Analysis of variance shows that sampling intervals had non- significant effect on soil Cr levels (Table 1). Soil Cr ranged from.6 to.7 mg/kg during the entire study period. Low amount of Cr was found at the 3 rd sampling interval (December) and high at the 4 th sampling interval (January) (Fig. 1). Soil Cr content reported during our study is lower than that reported in some earlier studies ( Hodgson, 199). The effect of sampling intervals on forage Cr levels was found to be non- significant (Table 1). It ranged from.22 to.28 mg/kg throughout all sampling intervals. There was a consistent increase in forage Cr content with sampling time. Higher value of Cr was found at the 4 th sampling interval (January), but lower at the 1 st sampling (October) (Fig. 1). The concentration of forage Cr reported in our study is considerably higher than that reported earlier by Ahmed et al. (28). It has been reported that different plant parts contain variable amount of Cr (Anderson et al., 199). All forage samples in our study area had low level of Cr which is not toxic for animals being reared at the farm. Sampling intervals had no significant effect on plasma Cr level (Table 1). The highest blood Cr concentration was found at the 2 nd sampling interval (November) and lowest at the 4 th sampling interval (January) (Fig. 1). The values at all sampling intervals ranged from.11 to.16 mg/l during our investigation. Although Cr is an essential nutrient for animals, its intestinal absorption is low with estimated range from.522 to 3% in fasting animals (McDowell, 23). However, increased growth rates have been reported in different animals due to Cr supplementation (Li et al., 1986). A non-significant effect (p.5) of sampling intervals was observed on milk Cr levels (Table 1). Higher milk Cr levels were observed at the 3 rd sampling interval (December) while lower at the 1 st sampling interval (October) (Fig. 1). Milk Cr ranged from.3 to.6 mg/l across all samplings. Flynn (1992) reported.2 mg/l Cr in milk, but in the present investigation all milk samples showed relatively lower values. The Cr levels reported were found in our investigation lower than those reported earlier by Hurley (1997) while working on milk mineral status of animals in USA. Correlation among soil, forage, plasma and milk Cr concentrations: The correlations between soil and forage, forage and plasma, and plasma and milk Cr concentrations were calculated. The correlation coefficient (r) between soil and forage Cr was found to be.37, forage and plasma -.25, soil and plasma -.25, plasma and milk -.12, soil and milk.7, and forage and milk.68. There was a positive and non-significant relationship between soil and forage Cr, negative and significant between soil and plasma, plasma and forage, and plasma and milk Cr levels. While positive and non significant relationships were found between soil and milk, and milk and plasma Cr concentrations in this investigation. These data show low or no correlations between different variables and in some instances even negative correlation coefficients between different variables have been noted. These findings corroborate with some earlier studies which also exhibited weak or no correlations among different parameters (Mtimuni, 1982; Tejada et al., 1987; Songonzoni et al., 1997).
4 3412 ZAFAR IQBAL KHAN ET AL., Soil Cr (mg/kg d.wt) Forage Cr (mg/kg d.wt) Plasma Cr (mg/l) Milk Cr (mg/l) October November December January Sampling Periods Fig. 1. Concentration of Cr in soil, forage, blood plasma and milk at different sampling intervals.
5 ASSESSMENT OF CHROMIUM IN SOIL-PLANT-ANIMAL CONTINUUM 3413 Table 1. Mean squares from analysis of variance of data for chromium levels in soil, forage, blood plasma, and milk at different sampling intervals. Mean squares Source of variation df Soil Forage Blood plasma Milk Sampling period 3.3 ns.2 ns.1 ns.4 ns Error ns = Non-significant Conclusions The results of the present investigation clearly depict that chromium levels were deficient in soil, forage and blood samples reflecting that Cr deficiency is a principal limiting factor for cattle production in this specific area. However, mineral supplementation investigations are required to assess the cost-benefit relationships of the provision of mineral mixtures including Cr supplementation to the grazing ruminants at this specific ranch. References Ahmad, K., M. Ashraf, Z.I. Khan and E.E. Valeem. 28. Evaluation of macro-mineral concentrations of forages in relation to ruminant s requirements: A case study in Soone valley, Punjab, Pakistan, Pak. J. Bot, 4: Anderson, R.A., M.M. Polansky, N.A. Bryden, J.J. Kanary and W. Mertz In: Seventh International Symposium on Trace Elements in Man and Animals, Dubroobnik, Yugoslavia. Bratakos, M.S., E.S. Lazos and S.M. Bratakos. 22. Chromium content of selected Greek foods. Total Environ., 29: Flynn, A Minerals and Trace Elements in Milk. Adv. Food Nutr. Res., 36: 29. Hodgson, J Grazing Management: Science into Practice. Longman Scientific and Technical, John Wiley Sons, New York, 199. Hurley, W.L Lactation Biology. Minerals and Vitamins, Ed. by University of Urbana, Illinois USA. Khan, Z.I., M. Ashraf, M.K. Mukhtar, N. Raza, K. Ahmad and N.A. Akram. 21. A study on the transfer of iron in soil plant animal continuum under semi-arid environmental conditions in Sargodha, Pakistan. Biol Trace Elem Res., doi:1.17/s Li, Y. And B.J. Stoecker Chromium and yogurt effects on hepatic lipid and plasma glucose and insulin of obese mice. Biol. Trace Elem. Res., 233. McDowell, L.R Nutrition of Grazing Ruminants in Warm Climates, Academic Press, San Diego McDowell, LR. 23. Minerals in Animal and Human Nutrition (2nd Ed), Amsterdam. Univ. Florida. McDowell, L.R. and D. Arthington. 25. Minerals for Grazing Ruminants in Tropical Regions. Extension Bulletin, Animal Science Department, University of Florida, USA Mtimuni, J.P Identification of mineral deficiencies in soil, plant and animal tissues as constraints to cattle production in Malawi. CTA Report 6. Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL. Anonymous The Role of Chromium in Animal Nutrition, National Academy Press, Washington, DC Parish, J. and J. Rhinehart. 28. Mineral and Vitamin Nutrition for Beef Cattle, (featured articles).
6 3414 ZAFAR IQBAL KHAN ET AL., Puls, R Mineral Levels in Animal Health: Diagnostic Data, (2nd Ed), Sherpa International, Clearbook, Canada, Songonzoni, M.G., L.R. McDowell, N.S. Wilkinson and J. Harrison Identification of nutritional status, emphasizing mineral, in Northwestern Zaire, Commun. Soil Sci. Plant Anal., 27: Tejada, R., L.R. McDowell, F.G. Martin and J.H. Conrad Evaluations of cattle trace mineral status in specific region of Guetemala. Trop. Agric. (Trinidad), 6: Tokalioglu, S., S. Kart and S. Gunes. 2. Determinations of heavy metals in soil extract and plant tissues at around of a zinc smelter. Intl. J. Environ. Anal. Chem., 8: Tokaliglu, S. and S. Kartal. 25. Determination of Cu, Pb, Cd, Ni, Cr, Co, Mn, Fe, and Zn in algae and vegetable samples using wet and dry ashing procedures. Trace Elem. Electr., 22: Underwood, E.J. and N.F. Suttle The Mineral Nutrition of Livestock. (3rd Ed.), Midlothian, UK, (Received for publication,march 1,,21
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